Roof ventilator



Sept. 11, 1928.

C. G. HAWLEY ROOF VENTILATOR Filed Dec. 1927 abtozmq Patented Sept. 11,1928.

UNITED STATES PATENT OFFICE.

CHARLES GILBERT HAWLEY, OF CHICAGO, ILLINOIS, ASSIGNQR TO CENTRIFIX.COR- PORATION, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

ROOF VENTILATOR.

Application filed December This invention relates to improvements inroof ventilators .andchimney cowls, and the object of the invention isto provide a chimney or ventilator top wherein advantage shall be had ortaken of wind pressure to increase the draft. To that end the inventioncomprises a tubular chimney or ventilator extension in combination witha whirl-promoting tuyere. of a barrel type containing many tangentialtuyeres and secured upon the top.

of said extension, In association with the fixed tuyere is a swingingtuyere back or box of U-shape in horizontal section, and with that partis associated a member through which it is swingably held and by theaction of which in the wind, the open end of the U-shaped tuyere box isalways presented to the wind. The arrangement is such that asubstantially uniform velocity pressure of air is maintained all the wayaround the tuyere. The air under pressure enters the tangentialtuyeres'thereof and self-organizes a vortex within the tuyere. Thelatter is co-axial with said tubular chimney or ventilator extension,and being free to expand axially through the upper end of thebarrel-like tuyere serves to greatly augment the draft or movement ofair or gases through said extension.

The invention will readily be understood on reference to theaccompanying drawings in which Fig. 1 is a side elevation of aventilator or draft-inducing device embodying this invention; Fig. 2 isa front elevation thereof, one half in section upon the line 22 of Fig.1; Fig. 3 is a plan View of the ventilator; Fig. 4 is a horizontalsection on the line 44 of Fig. 1; and, Fig. 5 is a detail verticalsection enlarged and better illustrating the varying and relativediameters of the aforesaid tubular extension and said tuyere.

In the drawing the tubular extension before mentioned is marked 1. It isintended to be placed at the top of a chimney, duct or other ventilatingstack requiring a strong upward draft. Secured to the top of the part 1is a broad ring 2, and some distance above it is a like broad ring 3;but the latter is characterized by a larger central hole 3. The

rings 2 and 3 are joined by a circumferential series of inclined tuyereblades 1, which as best shown in Fig. 4 form an equal-number of tuyeres5 which enter the internal space 6 tangentially. Thus is completed atthe top of the extension 1 a multiply tuyered generally cylindricalspace 6 which is of larger 6, 1927. Serial No. 238,041.

drain tubes which lead off from the floor 6 of the chamber 6. The beforementioned tuyere box or guard is marked 8. Asv best shown in Fig. 4 itis U-shaped in horizontal cross section, and as well shown in Fig. 2itis provided with top and bottom flanges 8 which are turned inward andwhich lie below andnearly meet the respective bottoms of the rings 2 and3. The purpose of this construction is to make substantially tightjoints and prevent excessive loss of pressure air from the box. The boxis of slightly larger diameter than the rings 2 and 3 and thus apressure air space 9 is provided at the sides and back of thebarrel-like tuyere. To be effective the box must swing so that its openend is always presented to the wind. To that end a spider 10 is providedon the top of the tuyere. That spider supports a vertical. post 11having a cap-like nut 12 at its top. A bearing sleeve 13 is journaled onthe post 11 to turn freely, and the sleeve 13 through the medium of asufiiciently extended flange 13 bears a hood portion 14. The latter inturn supports the box or guard 8 through the medium of the dependingbars 15 and 16. The hood 14 presents its low end above the open end ofthe box 8 and rises from that point, presenting its greatest area backof the pivot pin 11. The back of the hood is open so that the air andgases rising thereinto through the opening 8 may escape freely.

Preferably the hood is formed of a single piece of metal bent as shownand possessing in itself sufiicient strength (aided by the bracingshown) to withstand Wind velocities and maintain its shape against thesame. Due to its shape the hood swings with the wind, and in this isassisted by a top vane 14. The'latter to counteract the whirlingtendency of the gases emerging from the tuyere is inclined to the normalaxis of the hood, see Fig. 3. The simple journal bearing shown is easilyoiled. The end of the sleeve 13 rests upon the central part of thespider 10 and the weight of the hood is not great, so that there islittle friction to prevent the easy swinging of the hood. Obviously thecap-like nut 12 protects the oiled bearing and also prevents theaccidentallifting 0f the hood from the tuyere. The parts 10 and 11 maybe regarded as one and the part 10 is fastened to the top of the tuyere.

Swinging always toward the wind, the windward side of the tuyerereceives pressure air directly and by means of the distributing box 9pressure air is also supplied to the remainder of the tuyeres 5. Inconsequence of the entry of the large number of thin flat- Having thusdescribed my invention I claim as new and desire to secure by LettersPatent 1. The herein described draft inducing ventilator devicecomprising a tubular extension, in combination with a multiply tuyeredbarrel-like structure fixed upon the top thereof, containing a largeropening in its top and distinguished by top and bottom rings of greaterdiameter than itself, and a pressure air box enclosing one side of saidtuyere and supported to swing its open end toward the wind.

2. The device as defined in clailnl characterized by a verticallypivoted wedge-shaped cowl member which supports said box and serves toswing the same.

In testimony whereof, I have hereunto set my hand this 3rd day ofDecember, D. 4

CHARLES GILBERT HAWLEY.

